Max graetz



(No Model.)

M. GRAETZ. OIL BURNER FOR PRODUCING NON-LUMINOUS FLAME.

No. 594,395. Patented Nov. 30,1897.

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m mum UNITED. STATES PATENT @nrrcn.

MAX GRAETZ, OF BERLIN, GERMANY.

OIL-BURNER FOR PRODUCING NON-LUMINOUS FLAME.

SPECIFICATION forming part of Letters Patent No. 594,395, dated November 30, 1897. Application filed August 20, 1897. Serial No. 648,965. (No model. Patented in England June 26, 1897, N0.15,31'7- To all whom it may concern:

Be it known that I, MAX GRAETZ, manufacturer, a subject of the King of Prussia, German Emperor, and a resident of 31 Lausitzerstrasse, Berlin, in the Kingdom of Prussia, German Empire, have invented new and useful Improvements in Oil-Burners for the Production of Non-Luminous Flame, especially for heating incandescent bodies, (for which a patent has been obtained in Great Britain, No. 15,317, dated June 26, 1897,) of which the following is an exact specification.

This invention refers to oil-burners of the kind in which, first, the inner wick-tube is contracted at its upper end or is provided with a special contracting cap, respectively; second, a spreader or spreading-disk is arranged somewhat above said cap or above the wick-tube and the wick, respectively, and, third, the outer Wick-tube is surrounded by a cap reaching up to about the middle of the space between said spreading-disk and the upper ends or edges of the wick-tubes and forming, together with the outer wick-tube, an annular channel by which air is admitted to the outer side of the flame.

The parts and arrangements aforementioned are known. My improvements in burners of that kind relate to certain novel arrangements and combinations of parts which I am now going to describe with reference to the accompanying drawings, in which similar letters refer to similar parts throughout both Views.

Figure 1 is a vertical and Fig. 2 a transverse section of my burner.

The first characteristic feature of my improved burner consists in the spreader I), having a hood-like configuration, the rim being bent downward and terminating in about the height of the upper end of the cap it. Said rim is provided with apertures 6'. form of construction shown the lower end or edge part of said hood-lik e spreader is bent to a sort of flange 12 but I wish it to be understood that this does not form a point in my invention.

In the latter, allow of air entering said annular channel. This air passes into the interior or the inner space of the incandescent body, (indicated by dotted lines,) as does also the air ascending through the known annular channel mentioned in the first paragraph of this specification. The cap is, or, more precisely, the upper part of the same, forms at the same time an auxiliary support for the incandescent body. Openings 0, provided in the lower part of the cap It, serve for admitting air also'to the outside of said body. There is thus in my improved burner a fourfold supply of air. First, through the inner wicktube a. The current of air passing upward through this tube is contracted by the cap 0. so that the speed of said current is correspondingly reduced. Second, through the an nular channel formed by the outer wick-tube a and the cap is. The speed of the air passing upward through this channel is not impeded in any way. Third, through the annular channel formed by the caps 7c, and, fourth, through the openings 0 of said cap it. The upper part of this cap is located directly opposite to the openings b of the hood-like spreader b. The air passing upward through the inner Wick-tube or is first fully consumed for keeping the wick d burning. After a short time the draft of the air that passes through the inner annular channel (between the parts a and 7c) becomes so strong that the outer part of the circular flame is extinguished. The respective part of the upper end of the wick d is thus laid free and serves from that moment for the generation of gas. The latter mixes with the air supplied by the inner annular channel. Owing to the gas being developed rapidly and in large quantities, a part only of the mixture of air and gas can pass through the annular space between the upper edge of the cap kand the-flange b of the spreader, whereas the other part of that mixture passes into the cavity of the spreader and leaves the same through the openings 1). This other part forms, conseof the mixture of gas and air, occurs on the two parts of this mixture meeting and penetrating each other. In consequence of the flame being then furnished with another supply of air (through the annular channel between the two caps) even the various pointed extremities of the flame are rendered perfeotly non-luminous. Said other-t. e. ,thirdsupply of air is so great that there is an excess of oxygen. Owing partly to this excess of oxygen, which passes along the inner surface of the incandescent body, and partly to the fourth supply of air, which air passes along the outer surface of the incandescent body, the flame remains non-luminous even in a strong outer draft.

The lamp may well be used in the open air without any fear of the illuminating power of the incandescent body being impaired by soot. As far as known to me that effect has not been attained with any other construction of lamp or of burner, respectively, and, in fact, the purpose proper of my invention is to obtain the effect just stated.

Having thus fully described the nature of my invention, what I desire to secure by Letters Patent of the United States is- 1. In an oil-burner for the production of a non-luminous flame, the combination with the two concentric wick-tubes the inner of which is contracted at or near its upper end, of a spreading-disk having a downwardlybent rim and apertures in said rim, a cap surrounding the outer wick-tube, and terminating in about the height of the lower edge of said spreading-disk; and another cap surrounding said first cap, and terminating about the height of the lateral apertures of the said spreading-disk, substantially as and for the purpose set forth.

2. In an oil-burner for the production of a non-luminous flame, the combination with the two concentric wick-tubes a a, the inner of which a has a contracting cap a at or near its upper end, of a spreading-disk I) having a downwardly-bent rim and apertures Z) in said rim; a cap 70 surrounding the wick-tube a and terminating in about the height of the lower edge of said spreading-disk; another cap 70 surrounding said cap 70 and terminating in about the height of the apertures I) of the said spreading-disk, and openings 0 0 provided in the base parts of said two caps, the base part of the cap is being located above the base part of the cap 70, substantially as and for the purpose set forth and shown in the drawings.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

MAX GRAETZ. Vitnesses:

HERMANN ASSMANN, IIENRY HARPER. 

